Abstract: A container (10) of the type having side walls and top and bottom ends, the top end (2) including an access hole 4 surrounded by an upstanding neck (5) adapted to receive a suitable closure, wherein the neck is integrally formed from the material of the top end. There is also provided a closure (12) comprising a cap having a top (13) and a skirt (15) extending downwardly therefrom, the skirt having an internal thread (12a) to engage the external thread of the neck, wherein the top (13a) of the cap is formed in a concave shape, the opposite surface (13b) being convex and extending downwardly towards the interior of the cap.